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Finding the Fourth Proportional to 2,856.88, 4,285.32 and 909.12

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Solution

The fourth proportional to 2,856.88, 4,285.32 and 909.12 is: 1,363.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,856.88 : 4,285.32 = 909.12 : x
  2. Step 2: Convert to fraction form
    2,856.88/4,285.32 = 909.12/x
  3. Step 3: Cross multiply
    2,856.88x = 4,285.32 × 909.12
  4. Step 4: Simplify right side
    2,856.88x = 3,895,870.12
  5. Step 5: Solve for x
    x = 3,895,870.12/2,856.88
  6. Step 6: Final answer
    x = 1,363.68

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.